My puppy started teeth grinding last night randomly. He was fine all say and then about 9pm started grinding his teeth. I have Googled and most of the answers are teeth pain or stomach pain. However some stated that stress and aneixty can cause this. Last night we did have a friend around who has a very hyper and loud child. Also me and my partner had quite a loud disagreement and have spent time apart today. Could any of this caused him to start grinding his teeth, as he is used to me and my partner being together. He is still playful and still had a big apitite and shows no pain or discomfort when I feel around his mouth. Also his stools haven't changed and isn't bothered with me feeling his stomach. He doesn't show signs of being in pain or discomfort. He does the grinding when he lies down on his own. I'm worried. I forgot to mention. He only does it in the house.